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dvolpe
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Homework Statement
What is the mass defect of the 7Li nucleus (A = 7)?
Homework Equations
mass of 7Li nucleus per atomic table is 7.016004 u
N = A-Z or #neutrons = 7-3 = 4
computed mass of proton and neutrons in nucleus = 3 p*mass of p + 4n *mass of n
mass of proton = 1.00726 u
mass of neutron = 1.008665 u
mass defect = computed mass of protons + neutron - (atomic mass of nucleus per table)
The Attempt at a Solution
computed mass of p + n = 3(1.00726 u) + 4(1.008665 u) = 7.05644 u
mass defect of nucleus = 7.05644 - 7.016004 = .040436 u
Answer is .0421...help!